Enhanced processor for marine AIS

11 June 2008 Telecoms, Datacoms, Wireless, IoT

CML Microcircuits has announced new and unique functionality for its CMX7032 marine AIS (automatic identification system) Processor, to address growing market requirements.

The CMX7032 utilises CML's proprietary FirmASIC component technology, which configures on-chip sub-systems via a Function Image; this is a data file that is uploaded during device initialisation, configuring the device's function and feature-set. Function Image FI-2.0 is the latest market-driven release, offering manufacturers of marine AIS receiver devices dual-channel Rx-only functionality for the module. The Function Image can be loaded automatically from an optional external EEPROM or from a host microcontroller over the built-in C-BUS serial interface, facilitating in-the-field upgrades.

The CMX7032 includes two on-board auxiliary RF synthesisers along with two parallel Limiter-Discriminator Rx paths and an RS232 style/NMEA 0183-HS compatible output operating at 38400 baud. The device performs signal demodulation with associated AIS functions, such as training sequence detection, NRZI conversion and HDLC processing (flags, bit de-stuffing, CRC check). Integrated Rx data buffers are also provided, mitigating the need for a host IC.

Provision of a number of user-programmable areas in the Function Image allows the RF synthesisers of the CMX7032 to be programmed directly, which simplifies the system hardware design, reducing the overall equipment cost and size. Auxiliary DAC and ADC functions are provided to further simplify system hardware design and an allowance is made in the RS232 interface for an external GPS device to be connected, in order to reduce the proliferation of interface connections in the final product design.

To fully evaluate the CMX7032, CML offers the DE70321 - a complete AIS Class B (IEC 62287) technology demonstrator aimed at speeding up manufacturers' design and development of AIS Class B transponders and AIS receiver products, using the CMX7032.

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